DM74ALS5245N

Overview

The DM74ALS5245N is an octal bus transceiver from the Advanced Low-power Schottky (ALS) logic family, manufactured by Fairchild Semiconductor. It features eight bidirectional data paths with three-state outputs, enabling efficient data transfer between buses in memory and microprocessor systems. The device operates within a supply voltage range of 4.5V to 5.5V and supports TTL input and output levels. Key electrical parameters include a propagation delay of 10 ns, a low-level output current of 24 mA, and a high-level output current of -15 mA. It is housed in a 20-pin PDIP package and functions reliably across an operating temperature range of 0°C to 70°C.

Feature Summary

• Octal configuration providing eight independent bidirectional data channels for parallel communication.
• Three-state outputs allow effective bus isolation when disabled, preventing signal contention.
• Direction control input manages data flow direction between A and B buses.
• Advanced Low-power Schottky technology ensures improved switching speed and reduced power consumption.

Applications

• Memory systems requiring high-speed data buffering and isolation.
• Microprocessor systems utilizing asynchronous bidirectional data buses.
• General-purpose digital circuits needing controlled data transmission between different logic domains.

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels due to potential availability issues. Confirm RoHS compliance status and specific manufacturing date codes against current project requirements. Check for obsolescence notices or lifecycle changes that may impact long-term supply stability. Ensure packaging specifications match design constraints for PCB integration.

Selection Notes

Select this component for applications demanding fast switching speeds with moderate power dissipation. The ALS series offers a balance between performance and power efficiency compared to standard TTL or LS families. Consider the 20-pin DIP package for prototyping or through-hole assembly needs. Evaluate system voltage compatibility to ensure operation within the specified 4.5V to 5.5V range.

Part Context

This part belongs to the DM74ALS series, a line of advanced low-power Schottky logic devices designed for high-performance digital applications. The 5245 variant specifically addresses octal bus transceiver needs, differing from other ALS components like flip-flops or gates by its bidirectional data routing capability. It complements the broader 74-series ecosystem by offering enhanced speed over legacy counterparts while maintaining pin-out compatibility where applicable.

Replacement Considerations

Direct substitutes may include equivalent octal bus transceivers from the same ALS family or compatible variants from other manufacturers such as SN74ALS5245. Verify functional equivalence regarding pinout, electrical characteristics, and package dimensions before substitution.